This paper describes the operational issues and basic technical requirements of modern aerial photogrammetry. The accuracy of photogrammetric point determination and the y-parallax at corresponding model points is ana...This paper describes the operational issues and basic technical requirements of modern aerial photogrammetry. The accuracy of photogrammetric point determination and the y-parallax at corresponding model points is analyzed when stereo models are reconstituted by using the exterior orientation elements of aerial images. Real aerial photographs, at image scales from 1:2 500 to 1:6 0000, with DGPS/IMU data taken from various topographies in China were processed by our POS-supported bundle block adjustment program WuCAPS. The empirical results verified that the accuracy of the exterior orientation elements from bundle block adjustment meets the requirements of the specifications of topographic mapping. However, the accuracy of the exterior orientation elements determined by POS fails to meet the requirements of the specifica- tions of topographic mapping.展开更多
In this paper,we use multimode GNSS instead of single GPS constellation to resolve the three exterior line elements of each image.The principles of differential GNSS positioning and GNSSsupported aerial triangulation(...In this paper,we use multimode GNSS instead of single GPS constellation to resolve the three exterior line elements of each image.The principles of differential GNSS positioning and GNSSsupported aerial triangulation(AT)are presented and an implementation case is demonstrated.With multi-constellation system,the number of visible satellites is significantly increased and the geometry distribution of the satellites is well improved.The positioning accuracy and robustness are therefore getting better compared to GPS positioning.Experimental results show that differential GNSS has remarkable increment on the integer rate of ambiguity solution when GPS has few number and low elevation angle of satellites.The combined AT adjustment of GNSS resolution and 10 ground control points(GCPs)achieve the horizontal accuracy of±18 cm and vertical accuracy of±23 cm for the check points,which are comparable with traditional bundle adjustment with dense GCPs and better than GPS-supported AT.The achieved accuracy also satisfies the requirement for 1:500 topographic maps with the bonus of 84%GCPs eliminated.In conclusion,GNSS-supported AT is of feasibility and superiority for large scale Unmanned Aerial Vehicle-based photogrammetry.展开更多
基金Supported by the National Natural Science Foundation of China （No. 40771176, 40721001）, the Program for New Century Excellent Talents in University （No. NCET-04-0662）.Acknowledgement The experiment data acquisition are supported by Institute of Remote Sensing Applications Chinese Academy of Sciences, Zhong Fei General Aviation Company, Liaoning Jingwei Surveying ＆ Mapping Technology INC, Dalian Urban Surveying Design Institute, Siwei Aviation Remote Sensing Co. Ltd., Xi＇an National surveying ＆ Mapping Aviation Remote Sensing Co. Ltd and so on. These supports are gratefully acknowledged. The author would like to express his hearty gratitude to Fu Jianhong, Xie Chou, Ji Shunping and Yang Ming for participating in partial experiments. The author would like to thank Yang Ming and professor Zhang Jingxiong for their polishing in English.
文摘This paper describes the operational issues and basic technical requirements of modern aerial photogrammetry. The accuracy of photogrammetric point determination and the y-parallax at corresponding model points is analyzed when stereo models are reconstituted by using the exterior orientation elements of aerial images. Real aerial photographs, at image scales from 1:2 500 to 1:6 0000, with DGPS/IMU data taken from various topographies in China were processed by our POS-supported bundle block adjustment program WuCAPS. The empirical results verified that the accuracy of the exterior orientation elements from bundle block adjustment meets the requirements of the specifications of topographic mapping. However, the accuracy of the exterior orientation elements determined by POS fails to meet the requirements of the specifica- tions of topographic mapping.
基金This work was supported by the Chongqing Research Program of Basic Research and Frontier Technology[grant number cstc2016jcyjA0300]the National Special Fund for Surveying and Mapping Geographic Information Scientific Research in the Public Welfare of China[grant number 201412015].
文摘In this paper,we use multimode GNSS instead of single GPS constellation to resolve the three exterior line elements of each image.The principles of differential GNSS positioning and GNSSsupported aerial triangulation(AT)are presented and an implementation case is demonstrated.With multi-constellation system,the number of visible satellites is significantly increased and the geometry distribution of the satellites is well improved.The positioning accuracy and robustness are therefore getting better compared to GPS positioning.Experimental results show that differential GNSS has remarkable increment on the integer rate of ambiguity solution when GPS has few number and low elevation angle of satellites.The combined AT adjustment of GNSS resolution and 10 ground control points(GCPs)achieve the horizontal accuracy of±18 cm and vertical accuracy of±23 cm for the check points,which are comparable with traditional bundle adjustment with dense GCPs and better than GPS-supported AT.The achieved accuracy also satisfies the requirement for 1:500 topographic maps with the bonus of 84%GCPs eliminated.In conclusion,GNSS-supported AT is of feasibility and superiority for large scale Unmanned Aerial Vehicle-based photogrammetry.
